[gradsusr] setting time with intervals

Tue Jan 15 19:31:00 EST 2013

Thank you Jeff,
Since I can specify the interval in tdef, I can do whatever I want.

Thank you,

Sagar

On Tue, Jan 15, 2013 at 2:19 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:

> Since you are using GRIB formatted data, this is very easy to do.  The
> question remains what time interval you want.  In your initial email you
> said you wanted data only at 12 PM.  However, in subsequent emails, you
> said you wanted to use an interval of 2.  Given a time interval of 6 hrs in
> your data, those time increments do not match.  It's easy to make changes
> based on what you want, though.
>
> Anyway, everything you need to do involves changing the TDEF line of your
> control file:
>
> tdef 1460 linear 00Z01jan2009 6hr
>
> This controls the time interval of the data you will see.  That last entry
> is the interval.  Change it to 12hr or 24hr/1dy depending on what time
> interval you want.  Also you'll want to change the second entry, 1460,
> which is the number of time slices you want to view.  You'll either divide
> that by 2 or 4 depending on your time interval.  Finally, if you use a 24
> hour interval, make sure to change the initial time string (currently
> 00Z01JAN2009) to the correct UTC hour.  Let me know if you need
> clarification or any further examples.  You can find documentation on this
> at http://www.iges.org/grads/gadoc/descriptorfile.html#TDEF.
>
> Jeff
>
>
> On Tue, Jan 15, 2013 at 2:05 PM, Sagar Parajuli <psagar at utexas.edu> wrote:
>
>> Hi Jeff,****
>>
>> Attached is my ctl file. ****
>>
>> ** **
>>
>> Sincerely,****
>>
>> ** **
>>
>> Sagar Prasad Parajuli****
>>
>> Graduate Student/Research Assistant****
>>
>> University of Texas at Austin****
>>
>> Jackson School of Geosciences****
>>
>> 1 University Station C1100, JGB 5.322
>> Austin, TX 78712****
>>
>> Contact: psagar at utexas.edu****
>>
>> Cell: 512 965 4093****
>>
>> [image: texas-longhorn-logo]****
>>
>> ** **
>>
>> *From:* gradsusr-bounces at gradsusr.org [mailto:
>> gradsusr-bounces at gradsusr.org] *On Behalf Of *Jeff Duda
>> *Sent:* Tuesday, January 15, 2013 1:06 PM
>> *To:* GrADS Users Forum
>> *Subject:* Re: [gradsusr] setting time with intervals****
>>
>> ** **
>>
>> Sagar,
>> What does your control file look like?  Can you send it to me please?
>>
>> Jeff****
>>
>> On Tue, Jan 15, 2013 at 12:23 PM, Sagar P Parajuli <psagar at utexas.edu>
>> wrote:****
>>
>> Hi Jeff
>> I need to plot and print those extracted data. I know how to print it but
>> I want to know how to specify the time interval required. The code I am
>> using is:
>> open ERA.INTERIM.SFC.ctl
>> set lat 31.4
>> set lon 61.3
>> set t 1 last (It will print values pertaining to all t but I want to
>> specify an interval of 2).
>> set gxout print
>> set prnopts %g 1 1
>> d mag(no10usfc,no10vsfc)
>>
>> How can I specify the required time interval for t?
>>
>> thank you,
>>
>> -Sagar****
>>
>>
>>
>> ****
>>
>> On Tue, Jan 15, 2013 at 10:03 AM, Jeff Duda <jeffduda319 at gmail.com>
>> wrote:****
>>
>> What do you want to do with the data?  Do you want to make plots in Grads
>> or just extract the data?  If it's the latter, then you don't really even
>> need to use Grads.
>>
>> Jeff****
>>
>> ** **
>>
>> On Tue, Jan 15, 2013 at 8:47 AM, Sagar P Parajuli <psagar at utexas.edu>
>> wrote:****
>>
>> Hi Jeff,
>> I think I didn't clarify my question. I am writing control file for
>> extracting some wind speed data corresponding to particular time of a day.
>> What I could do in grads is:
>>  set t 1 last
>> But I want to do this skipping certain values eg. I want values
>> corresponding to t = 1, 3, 5, 7, 9, etc (i.e. with certain interval). So, I
>> need to skip some data and only extract those datas.
>> How can I do this?
>>
>>
>> Thank you so much again.
>>
>>
>>
>> Sagar****
>>
>>
>>
>> ****
>>
>> On Mon, Jan 14, 2013 at 11:13 PM, Jeff Duda <jeffduda319 at gmail.com>
>> wrote:****
>>
>> Time interval is specified in the control file used to open the data
>> file.  However, if you used xdfopen or sdfopen, there may be a different
>> way to determine the time interval.  In those cases, you should be able to
>> find it by dumping the contents.  If your data are in netCDF format, for
>> example, you could use ncdump -h (data file) to find out.****
>>
>> ** **
>>
>> Jeff Duda****
>>
>> On Mon, Jan 14, 2013 at 9:47 PM, Sagar P Parajuli <psagar at utexas.edu>
>> wrote:****
>>
>> Hi all,
>> I need to extract wind speed data at a particular time (12:00 pm only)
>> everyday from the 6 hourly data of one year. So I need to set time as,
>> t = 1, 1460, 2 (start, end, interval). How is the time interval specified
>> in grads?
>>
>> Thank you very much for your help.
>>
>> ****
>>
>> ** **
>>
>> *Sagar P. Parajuli*****
>>
>> Graduate Research Assistant****
>>
>> The University of Texas at Austin
>> Jackson School of Geosciences
>> e-mail: psagar at utexas.edu****
>>
>> Contact: +1 512 965 4093 ****
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr****
>>
>>
>>
>> ****
>>
>> ** **
>>
>> --
>> Jeff Duda
>> Graduate research assistant
>> University of Oklahoma School of Meteorology
>> Center for Analysis and Prediction of Storms****
>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr****
>>
>>
>>
>>
>> -- ****
>>
>> Best regards,****
>>
>> ** **
>>
>> *Sagar P. Parajuli*****
>>
>> Graduate Research Assistant****
>>
>> The University of Texas at Austin
>> Jackson School of Geosciences
>> e-mail: psagar at utexas.edu****
>>
>> Contact: +1 512 965 4093 ****
>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr****
>>
>>
>>
>>
>> --
>> Jeff Duda
>> Graduate research assistant
>> University of Oklahoma School of Meteorology
>> Center for Analysis and Prediction of Storms****
>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr****
>>
>>
>>
>>
>> -- ****
>>
>> Best regards,****
>>
>> *Sagar P. Parajuli*****
>>
>> Graduate Research Assistant****
>>
>> The University of Texas at Austin
>> Jackson School of Geosciences
>> e-mail: psagar at utexas.edu****
>>
>> Contact: +1 512 965 4093 ****
>>
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr****
>>
>>
>>
>>
>> --
>> Jeff Duda
>> Graduate research assistant
>> University of Oklahoma School of Meteorology
>> Center for Analysis and Prediction of Storms****
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>

-- 

**
Best regards,

* *

*Sagar P. Parajuli*

**Graduate Research Assistant

The University of Texas at Austin
Jackson School of Geosciences
e-mail: psagar at utexas.edu
Contact: +1 512 965 4093
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